Scaffold.



N0. $40,398. PATENTED OCT. 6, 1903;

M. A. GHBVBS.

SGAFFOLD. I APPLICATION FILED NOV. 14, 1902.

K0 MODEL.

UNITED STATES Patented October 6, 1903.

PATENT @FFICE.

SCAFFOLD.

SPECIFICATION formingpart of Letters Patent N 0. 740,398, dated October6, 1903.

Application filed November 14, 1902. Serial No. 131,347. (No model.)

To all whom, it may concern:

Be it known that I, MERRELL Aurnv OHEVES, a citizen of the UnitedStates, residing at Marshall, in the county of Harrison and State ofTexas, have invented certain new and useful Improvements in Soaffolds;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being badto the accompanying drawings, and to the figures of reference markedthereon, which form a part of this specification.

My invention relates to extension-scaffolds, and comprises a platformcarried on toggles, which are operated from said platform to raise orlower the same.

The object of my invention is to provide means for extending thescaffold to considerable height when necessary and also for securing twoor more scaffolds together.

A further object is to provide a strong and rigid structure having nocomplicated parts and which may be easily manipulated.

In the drawings, Figure 1 is front elevation of my invention. Fig. 2 isan end elevation of the same. Fig. 3isa front elevation showing themanner of extending the toggles to raise asecondary platform to agreater height.

Referring specifically to the drawings, 6 indicates the base of thescafiold, and comprises the side timbers 6', standing on legs 6. Thetoggles are arranged in pairs, and comprise the lower toggle-bars 7,pivoted to the side timbers 6 at 7. The uppertoggle-bars 7 are pivotedto the platforms at '7. The bars 7 and 7 are pivotally connected at 7 toknee-blocks 9 and 10. The screw 11 passes through a threaded bore in theblocks. The screw comprises two sections, one for each pair of toggles,and each section has a right thread 11 and a left thread '11" for there-- by a suitable hand-crank 14. If desired, a a

* To steadythe sc'afiold, I provide putlogs 15,

which set against the house or-other structure. Said putlogs areslidingly mounted in slots 8 in the lodgers 8 of the platform and areadjusted to the desired distance by thumbscrews 8 inihe block 8 securedto the lodgers. Lateral braces 16 extend from the end of the platform tothe ground. They are adjustable for different heights by means of aseries of holes 1b and pins 16 projecting from the platform. The lowerends of the braces have claws or spikes 16 to enter the ground. Brackets17, removably secured to the platform 8, are for the purpose of boldinglumber, tools, 860.. c 4 To use the scafiold at a considerable height,

' the modification shown in Fig. 3 is employed.

The upper bars 7 of the toggles are lengthened by lazy-tongs,comprisingarms 18,joined to the bars by screw strap-clamps 18 and arms 19, pivotedto the ends of the arms 18.

The extension thus formed carries a suitable.

platform 20 Two or more scaifolds may also be superposed. For thispurpose I provide pins 21, secured to the side timbers 6 to enterstaples 22 on the lodgers 8 ,the brackets 17 being first removed fromthe platform 8.

" Itwill be seen that the hoisting device can be operated by a workmanon the platform.

Having thus described my invention, what is claimed as new, and desiredto be secured by Letters Patent, is- 1. A scaffold comprisingabase,aplatform, hoisting-toggles between the same, removable lazy-tongssecured to said toggles, a platform carried by the lazy-tongs and meansto operate the toggles, substantially as shown and described. Y

2. A scaffold comprising a base and a platform, toggle-bars pivotedthereto,knee-blocks therebetween to which the toggle-bars are same toturn the screw, substantially 'as depivoted, a screw extendinghorizontally scribed. through the knee-blocks, a pulley on .the Intestimony whereof I affix my signature screw, standards supported by thescrew and in presence of two witnesses.

5 extending above the platform, a second pul- MERRELL AUTRY CHEVES.

ley journaled in the standards above the plat- Witnesses: form, a beltconnecting the pulleys, and a M. B. PANCHMAN,

crank on the platform-pulley operating the T. L. WHALEY.

